톱니형휜이 부착된 2중 열교환관을 이용한 엔진 배열회수기에 관한 실험적 연구
An Experimental Study on the Heat Exchanger for the Engine Waste Heat Recovery Using Serrated Fins and Bayonet Tube
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Abstract
In this study, high performance waste heat recovery heat exchanger was developed using the bayonet tube with spiral serrated fins. Especially, heat exchanger of the bayonet tube type was operated well because of double water passes mechanism and characteristics. A cooling water passes down inner tubes to thimble-form tubes, then flows back up as it boils. The heat exchanger of bayonet tube type was composed of steel tube with 7 channels(I.D1 14mm, I.D2 31.6mm) and spiral serrated fins. The performance tests were conducted under the following conditions ; A cooling water flow rate was 273 kg/h and engine rpm was varied from 750 rpm to 3500 rpm. From the experimental result, waste heat recovery was 9.21 kW when engine rpm was 3500, and pressure drop was 15 ~ 260 mmHg/㎥. The effectiveness of heat exchanger was about 0.7 ~ 0.9. The performance of heat exchanger was evaluated by using the -NTU method. In the study, the NTU of the heat exchanger was 1.57~2.33.
참고문헌 (9)
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